How many kJ of heat are required to melt 50.0 g of ice at its melting pt?

How many moles of HCl can be neutralized by 0.1 liter of 0.5 M NaOH? A. 0.1 B. 0.05 C. 0.5 D. 0.4

Activation energy is?

What are the units for the following variables associated with the gas laws? a. Pressure (P) b. Volume (V) c. Temperature (T) d. Moles (n) e. Gas Constant (R)

What fact do scientists believe provides evidence for the big bang theory? a. all comets follow elliptical orbits. b. most extra-solar planets are gas giants. c. all stars feature nuclear fusion in their core. d.

What does the group number on the periodic table tell you?

What is the most abundant substance dissolved in sea water? magnesium chloride sodium chloride

How could you determine the amount of hydrogen needed for a space flight

A neutral atom has two electrons with n = 1, eight electrons with n = 2, eight electrons with n = 3, and one electron with n = 4. It has no other electrons. What is the atomic number of this element?

A new substance is it a chemical or physical change

Which chemical group is most likely to be responsible for an organic molecule behaving as a base